Risa is a slim young woman of middling height, and also has blue eyes and hair in a boycut. She has shaved eyebrows, thin lips, and wears dark eyeliner that gives her a hawkish and tough appearance. Risa is usually seen wearing the standard female school uniform, and wears a embellished prison guard uniform while on guard duty. She is always seen wielding a shinai (a bamboo kendou-style sword), and can replace it with any long hard object from the environment if need be (such as a metal pipe).

Risa is a confident and kind character who is willing to diligently work to please Andre through his masochist tendencies, by becoming a dominatrix. She has a strong crush on Andre which develops throughout the series. A capable kendou practitioner, Risa is able to use her shinai with great proficiency. She is highly loyal to the Aboveground Student Council President Kate Takenomiya to the point of ruthlessness. Though she can be cold at heart when efficiency in completing orders is needed, Andre believes she is kind at heart inside her tough exterior, if a little too kind for her dominatrix efforts to be successful. Andre's admiration for the Vice-President's brutal punishment and figure is a cause of jealousy for her.

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